Phlox Annual

Phlox drummondii

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verifiedReviewed by the GreenScout Team

A vibrant annual flower native to Texas, prized for its profuse clusters of small, colorful blooms in shades of pink, red, purple, and white. Phlox annual grows quickly and flowers abundantly from summer through fall, making it excellent for borders, containers, and cottage gardens. It thrives in warm weather and produces a light fragrance.

Common Problems

Select the problem your Phlox Annual is experiencing to get a treatment guide.

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Powdery Mildewchevron_right

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Yellow Leaveschevron_right

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Leggy Growthchevron_right

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Overwateringchevron_right

Care Guide

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Light

Full sun (6–8 hours daily); tolerates partial shade in hot climates

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Water

Keep soil consistently moist but not waterlogged; water at soil level to avoid leaf spotting; allow soil to dry slightly between waterings

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Soil

Well-draining, moderately fertile soil; loamy, slightly acidic to neutral pH (6.0–7.0)

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Fertiliser

Apply balanced fertilizer monthly or use slow-release granules at planting; avoid excessive nitrogen to prevent leggy growth

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Temperature

Warm-growing annual; prefers 70–85°F; does not tolerate frost

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Humidity

Moderate humidity; avoid overhead watering to prevent powdery mildew

Toxicity

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Non-toxic to all household members

Common Diseases

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Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

Why does my Phlox Annual get powdery mildew so easily?

It's prone to powdery mildew, especially in humid conditions with poor air circulation — water at soil level rather than overhead and space plants well to keep foliage dry.

How long does Phlox Annual keep blooming?

It flowers abundantly from summer through fall, growing quickly and producing profuse clusters of small, colorful, lightly fragrant blooms the whole season.